Q17 of 26 Page 1

(i) Draw the geometrical isomers of complex [Pt(en)2Cl2]2+

(ii) On the basis of crystal field theory, write the electronic configuration for d4 ion, if Δ0 > P.


(iii) Write the hybridization type and magnetic behavior of the complex [Ni(CN)4]2-. (Atomic number of Ni = 28)


(i) Geometrical isomers of complex [Pt(en)2Cl2]2+



Geometrical isomers are those which have the same formula but different arrangement of ligands.


(ii) Electronic configuration for d4 ion, if Δ0 > P is .


P is the energy required for electron pairing, Δ0 is the crystal field splitting. Since the energy required for pairing P is lesser, the fourth electron did not want to spend its energy by occupying the eg level and hence the configuration is zero in eg level.


(iii) [Ni(CN)4]2- complex exhibits dsp2 hybridization and since all the electrons are paired it is diamagnetic in nature.



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15

Calculate the emf of the following cell at 250C:

Zn|Zn2+(0.001 M) || H+(0.01 M) | H2(g)(1 bar) | Pt(s)


2E0(zn2+/Zn) = -0.76 V, E0(H+/H ) = 0.00 V


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Give reasons for the following observations:

(i) A delta is formed at the meeting point of sea water and river water.


(ii) NH3 gas adsorbs more readily than N2 gas on the surface of charcoal.


(iii) Powdered substances are more effective adsorbents.


 18

(a) Why are alkyl halides insoluble in water?

(b) Why is Butan-1-ol optically inactive but Butan-2-ol is optically active?


(c) Although chlorine is an electron withdrawing group, yet it is ortho- , para- directing in electrophilic aromatic substitution reactions. Why?


 19

How do you convert the following:

(i) Benzoic acid to Benzaldehyde


(ii) Ethyne to Ethanal


(iii) Acetic acid to Methane


OR


Write the equations involved in the following reactions:


(i) Stephen reaction


(ii) Wolff-Kishner reaction


(iii) Etard reaction